The invention provides a decoction for promoting fertility. The decoction has functions of nourishing liver and kidney, warming yang and securing essence and can be mainly used for treating male infertility with an excellent effect; the male infertility comprises the following symptoms: sexual disorders such as impotence, spermatorrhea and anejaculation, dysspermia such as oligospermia, low active ratio, dead spermatozoon and nonliquefaction of semen, yang deficiency and the like. Traditional Chinese medicine composition of the decoction is prepared from the following 36 compatible raw materials according to weight: prepared rhizome rehmannia, Chinese yam, dogwood, poria cocos, rhizoma alismatis, salivia chinensis, semen allii tuberose, Chinese wolfberry, rubus idaeus, flatstem milkvetch seed, semen cuscutae, radix achyranthis bidentatae, cistanche, human placenta, bombyx mori, isinglass and the like. The decoction is excellent in effect for treating infertility caused due to poor sperm motility or few sperms, excellent in effect for treating male infertility and quick in curative effect; the decoction is prepared from natural traditional Chinese medicine components, so that the decoction is free of side effect; the formula of the decoction has the functions of strengthening sperms and effectively increasing the number of the sperms.